That's incredibly cool actually, what was the book? Could you share anything he wrote which you found especially interesting?
Here is my github repo with scans of the marginalia from Edison: https://github.com/RRWagner/Making-Good-in-Business-Babson-E...
"History proves that religion is a curse and is the master scheme for Exploitation of man" - p47
"God helps nobody. 20 million perished in the late war — for no fault of theirs Why did God permit this" - p48